Alternatively, some companies are simply interested in the final OEE result and accompanying data to support the “Quick” OEE calculation: OEE, Total Ideal Operating Time, and Total Net Available Time (NAT), where OEE = Total Ideal Operating Time / Total Net Available Time.

The formats presented are more meaningful for dedicated processes. Calculating OEE is slightly more complex for machines that are subject to multiple tool changes to produce a variety of parts. In this case, it is more meaningful to calculate OEE by production run or work order.

We suggest using an existing production report that has been modified to provide the data required to calculate OEE for either of the formats suggested.

Typically, low OEE performance is primarily attributed to unplanned downtime events and, to a lesser degree, quality events. As such, a means to record these events should be provided on the production report or separate document. Doing so ensures that corrective actions address real concerns that in turn will result in ever improving OEE results.

Finally, we offer several template formats that are immediately available from the “free downloads” widget (see sidebar) or from our downloads page. These templates can be modified to suit your specific needs and are offered free of charge and without obligation.